Portable telephone.



0. L. MULO?.

PORTABLE TELEIJHONB.

A1 PLI0ATI0N FILED 00T. 12. 190s.

@gpg D' l Faented Deo. 7, 1909. 'y 2 SHEETS-#SHEET 1.

. 4 A 35W ,s ma i) @mi Stmme-4j 0. L. MULOT'.

PORTABLE` TELEPHONE.

APPLICATION FILED 0CT.12,190B. @g e Patented Dec. '7, 1909.

2 SHEETS-SHEET 2.

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oT'ro LOUIS iv'iULoT," or BROOKLYN, NEW YORK.

PORTABLE TELEPHONE.

Specification of Letters Patent.'

y Patented Dec.' 7, i909.

Application filed October 12, 1908. Serial No. 457,409.

l To all whom it may concern:

Be it known that I, OTTO L. MULo'r, a citizenlof the United States,residing at Brooklyn, in the county of Kings and State of'rNeW York,have invented new and useful `Improvements in Portable Telephones, of

Which the following is a specification.

, My inveiitio1i-relates to telephone instruinents, and moreparticularly, to instruments of the portable type.

With the usual practice of installing a telephone at a fixed point in abuilding, great inconvenience is frequently caused by the necessityof aperson being obliged to go to this fixed point whenever desiring to usethe instrument. For example, in private dwellings, where the telephoneis usually located on the lower floor, and the bed rooms on theuppertloors, the instrument is q uite inaccessible, should any memberyof the family desire to use the same during the night. And it sometimeshappens, that, in:

casewof tire or burglars, under these conditions, it is entirelyimpossible to reach the telephone at all.

lIt 1s t-he primary object of the present in: vention, therefore, toprovide 4a telephone set that may be i'eadily'lniovcd froinplacetoplacc, andA connected to the outgoing circuit wherever desired.

LA further object of the invent-ion is to provide a telephone set ofthis nature and so wire aA building that the instrument may be connectedto the line at any one of a plu- ,rality of` points, Without thenecessity for a localswitcli board.

Avifurthcr object of the invention is to construct a self-.coiitaiiicd,portable telephone set of -the `desk stand type, whichshall be lightandvcompact, and capable of being easily moved about.

zlyitlithe above and other objects in view, and to improve generallyupon the details of construction ofsuch apparatus, my invention consistsofA the, construction and arran,`geincnt.l of.,v parts hereinafterdescribed.

and ilustrated inthe accompanying draw.-

ings, in which ip Figure. 1l issan elevation, showing myinivMprovedftelephone set, complete as it appears,

ready for use. Fig. 2 is a front v iew of one of the ,sockets orreceptacles hereinafter deillustrated in Fig. 5.

scribed. Fig. 3 is a transverse section therei of, showing a slightmodification. Fig. 4 is a top plan view of the connecting plug,hereinafter referred to. Fig. 5 is a View of the stand itself, showingthe parts thereof separated. Fig. (S is av vertical sectional view ofthe base of the stand, yon an enlarged scale. Fig. T is a horizontalsection thereof. Fig. 8 is a diagram of circuits.

Referring to the drawings .in detail, the baseof my improved stand isdesignated by the reference numeral 1. As clearly shown, this base is inthe shape of the frustuin of a pyramid, having a quadrangular, aiidpreferablyv square bottom. The post or standard of my instrument issplit vertically intov two sections or halves, 2, 3, one of which, suchas i2, is rigidly secured to, and

preferably formed integral with the base 1.

At the junction of the standard and post l preferably forni a boss l,having a socket adapted to receive the endy of the othervsec tion 3, ofthe standard. l The lower end 3,

of this section 3. is rounded on one side', as l shown in Fig. t3, inorder to permit of its occupying ythe inclined or open position tdesignates'tho usual transmitter, and 5 the receiver, which' issupported upon a receiver hookti, as iscustomary in sets of the deskstand type. M

llaeh section 2 and 3 terminates at its upper end in a prong T, whichprongs, when titted together form a crotch for the recep tion of a flugon the transmitter.y A screw 8` passes through the prongs 7, and servesthe double purpose of holding` the sections 2, 3, together.andofmaintaining the transmitter in position.'

Instead of arranging the ringer in a sepa',-

rate box. as is the con'nnon practice,'1 mountv it directly in the baseof thex stand. 1,0, 10, designate bellsof the usual type, secured,

by means of screws11, to one vof the faces of the pyramidal base. Thesescrews lare preferably lperpendicular to the said face, and, at theirinner ends, may be set into. suitable nuts, pr into a block l2, which maserve as a? yokcfor the ringer magnet coi s 13. These ringer coils areof the ordinary, -r

or any suitable construction, and seive t0 operate the usual .hannnerll, carried by the rocking armature 15, pivoted in a bracket 16, securedtothe inside of the base. The condenser, 17, required in common batterysystems of telephony,.is also mounted in the base, and may be attachedto a removable bottom 9, secured to-the base by means of screws. Theconstruction above described is to be regarded as illustrative only,since the exact details are immaterial, so long as the broad idea ispreserved, viz. the mounting of both condenser and ringer in the base ofthe instrument.,` Other vdetails lof construction and arrangement willreadily suggest themselves to those skilled in the art, and may beresorted to without departing from the spirit of the invention, or thescope of the appended claims.

An important feature of` the invention resides in the disposition of theinduction coil. This I arrange Within the hollow post 2,v 3, of thestand, as indicated at 18 in Fig. 5, and secure it in place by means ofscrews I 20, passing through lugs or brackets 19, at-

tached to the section 2.

vThe usual cord 21, extends from the base to the receiver, and a secondcord extends from the base to a plug ot connector. This v plugpreferably comprises a plate 23, of insulating material, provided with ahandle 24:, on one face, and having projecting :trom the other face apair olf' metallic spikes 25, 26, and a guide pin 27. The tWoconductors, 22, and 22" of the cord 22 are connected to the kes, whichthus forin the terminals 'of both 'the talking and' ringing circuits oithe portable set. lhe socket or receptacle for this plug comprises aplate 28, having openings 2t), for the reception ot the spikes-25, 26,and having a hole 3l), adapted to receive the pin 2T. linmediately backolf each opening.) is disposed al pair ot contact springs 3l, arrangedso as to be normally in contact with each other, and adaptedto be forcedapart by the spikes 25, 26, and make therewith a rubbing engagement.These spikes are preferably polygonal in cross-section, and may bediamond-shaped, as shown. They taper gra l.

ually from point to butt, so that they `may be' readily inserted in thereceptacle.

ln Fig. 8 is shown the method ot' wiring a (say) three story house, formy system. 'l`hc line Wires, 32, 233 come in, usually near the root, andextend down to the first lloor, or to the lowcrmost point at which il'.will ever be desired to use the telephone. ()n each lloor islocatedalsocket, or receptiwle, con'iprising, as shown, a pair of contacts, 31,in each side ol the circuit. Since these contact springs are normally inengagement with each other, it will be evident that the circuit, willalways be closed at any receptacle not in use, and thus a continuousconnection preserved.

Il`he receptacles may be set llush into the wall X, as in Fig. 1` orarranged to stand out therefrom. as shown at' 2S in Fig. 3.

It will thus be seen that 1 have provided a light, compact.self-contained, portable telephone set of the desk stand type, which maybe easily carried from place to place, and connected with`the line atany desired point in a very simple manner, and it is thought thenumerous advantages of my invention will be readily appreciated by thoseskilled in the art. i

What Iclaim is 1. A portable telephone set of the desk stand typecomprising a base, a supporting postsecured therein, a transmittercarried at the upper end of said post, a receiver hook pivoted in theside of' said post, a receiver of the usual type supported by said hook.a ringer located in said base, an induction coil disposed within saidpost, and operative connections between said parts terminating in asingle pair of conductors, said eornluctors constituting the leads forboth the talking and ringing circuits, and adapted to be connected toany point of an external circuit.

A portable telephone set of th desk stand type comprising a base, ahollow supporting post secured therein, a transmitter carried at theupper end of said ost, a receiver hook pivoted inthe side otp said postand controlling the telephone circuits, a receiver of the usual typesupported by said hook, a conductor cord extending from said receiver tothe base of the instrument, ringer coils and a condenser disposed withinsaid base, aninducl'ion coil located in said hollow post. operativeconnections between said parts` and Aa conductor cord exteuding'fromsaid base` and 'Forming the terminals of 'both tluiringiug and talkingcircuits,y and provided at its end with a contact plug adapted to belinserted in a suitable socket located at any desired point in anexternal circuit.

t. .\v portable telephone set of the. desk stand type comprising ahollow pyramidal base and a supporting post rising therefrom,

a transmitter and receiver supported by said post, a condenser supportednext lthe bottom of said base, a ringerabove said condenser and next thelop of said base, and bells for said ringer mounted side .by side ononel 0fthe llat faces of said base.

fl. ln a portable telephone set of the desk stand type, a. supportingpost split vertically into two sections, each ot said sections having atits upper end a prong, a transmitter supported between said prongs, andasiligle screw maintaining all ol'A said parts inposh lion.

ln a portable telephone set ot the desk stand type, a base, a supporliugpost divided vertically into lwo sections. one olZ said'scc tions beingrigidly secured to the base and supporting directly the receiver andtransmtter, a socket in the base adjacent said In testimony whereof Ihave hereunto set section into which one end of the other seemy hand inpresence of two Subscribing tion is adapted to fit, the said socketbeing witnesses.

relatively deep and the said end of said see- OTTO LOUIS MULOT Lionbeing rounded off, and means for securftnessesz ing said sectionstogether at their ends away LEWIS LAUZER,

from said base. J UNA SAN'NZF..

